The factory measured an open distance of about 1200 meters, and the measured power was 28DB, which is definitely 1.5W. It is recommended to use 1.2G rather than 2.4G when there are many walls blocking the way. 2.4G can be for open and long-distance transmission. Microwave transmission frequency is low, and penetration is strong, but the distance is short. The frequency is high, the distance is long, and the penetration is weak. So it depends on the actual environment! Receiver parameters: Working frequency: 1.2G or 1.3G Working voltage: DC12V Working current: 250mA Voltage: DCand12V Current: 500mA Transmitting power: 1500mW Working frequency: 1.2G or 1.3G Channel selection: 8 channels audio and video synchronization Transmitting distance: (open and barrier-free) more than 1 km (directly related to the gain of the antenna and the external environment) Transmitter parameters: Moderation type: FM Receiving frequency: 0.9-1.2GHz Receiving signal: audio and video, image synchronous transmission Receiving sensitivity: -85dBm Video input level: 1Vp-p Audio input level: 1Vp-p Working temperature: -20-and50C or -4-and122H Working humidity: 85percent RH Storage temperature: -40-and80C or -40-and185H Colour:As Shown Material:Metal Package Contents: 1 x Transmitter 1 x Receiver Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm.